What is wifi calling or VoWIFI

Wifi Calling is also known as VoWifi or Voice Over WiFi network.  In Wifi calling, your regular internet connection works as a mobile tower, to connect a mobile device to the telecom network. You might be using the internet connection for voice calls for a long time, but here it is different the way for you and mobile operators. This tutorial will explain the details, for wifi calling, how different from VOIP, advantages, disadvantages, etc.

Wifi network is very common these days. The network provides access to the Internet over a wireless channel.  It uses a router, which has an antenna for wireless network connection and ports to connect the Internet. Wifi calling uses radio interface to make and receive calls in such a way as using GSM network tower. With wifi calling mobile network operator gets more coverage, without installing new gsm mobile towers.  There might be chances that you are carrying a mobile phone in a building basement, that phone may lose the radio network. But if wifi calling supported, then the phone will switch to wifi network seamlessly. You can avail of all the services, even if no cellular network is present.

The internet packets tunnels to the mobile operator’s network. This enables the mobile operator to control the services for your mobile.

Wifi Calling and VOIP: 

VOIP or Voice Over IP looks similar to the wifi calling. But these are two different things. In the VOIP call, an additional application needs to install e.g Skype. The identity of contact is different from the phone number. The back-end network of internet provider is used. In VOIP, there will be no interaction with the core network of a mobile operator.

Wifi calling, do not need any additional application on the phone.  The phone authenticates itself with the core network as it is doing on a normal cellular network.

Benefits of Wifi Calling :

It adds more coverage for a mobile operator by using the WiFi network along with the existing telecom network.

Wifi can be used in places where the strength of a cellular network is weak or no network.

Fix line operators can also start mobile services without buying cellular networks.

No need to install any additional application to make or receive calls over wifi network.

Phone contacts remain the same as they used for the normal call over the gsm network.

Quality of call over wifi is generally good, as most of the places install very high-speed broadband connections and good quality wifi routes.

Most of the smartphones support the wifi calling. No additional device or application is required.

Offloads the mobile operator carrier traffic.

All calls are routed from the mobile operator’s network. This secure the communication as to third party server involves.

Enable Wifi Calling

The wifi calling feature by default is not active. The mobile user has to enable the feature manually. Most of the smartphones have a setting available for wifi calling.  At the same time, the mobile network operator should also support the wifi calling.

Enable wifi calling iPhone:

When it comes to smartphones. iPhone is considered to be a good one. It has all advance options, wifi calling is one of them. To enable this feature, the subscriber has to to do the following.

  1. Click on the settings icon.
  2. Click on the phone.
  3. Enable the wifi calling by from slider.
  4. Give the warning, tap on enable.

Enable Wifi Calling on Andriod :

These days Andriod is a very common platform for mobile devices.  Many phone manufacturers have adopted the android as the OS for them. The steps may vary for each phone vendor or model from the same phone vendor.  I am using s8. The following are the steps.

  1. Click on settings,
  2. Click on connections, then wifi calling.
  3. Use the slider to turn on the feature.

Mobile network for wifi calling or VoWifi:

The mobile network keeps evolving. Which results in more services and more productive experience to a mobile subscriber.  The latest mobile generation is 4G or LTE.  Wifi calling is possible with the LTE network only.  LTE’s core network called EPC.  It can connect a non-3GPP network to the mobile core network. The IMS is the additional component that is needed for wifi calling and VoLTE.

Does a question come,  that how a wifi network signaling converts to the LTE-EPC  network? This is possible via a gateway ePDG or evolved packet data gateway.  This connects public internet to the LTE network. A secure IP based communication takes place between wifi network and ePDG.

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